Safety shield for an injection device

An injection device comprising:

• a housing defining a longitudinal axis and configured to receive a medicament container containing a medicament, the housing having a distal end which defines an opening for receiving a portion of a needle operably coupled with the medicament container;
• a safety shield surrounding at least a distal portion of the housing, the safety shield configured to advance distally relative to the housing from a retracted position, to a deployed position for shielding the needle;
• and
• an advancement spring arranged between the housing and the safety shield, the advancement spring configured to advance the safety shield from the retracted position to the deployed position,
• wherein the advancement spring is configured to interlock with the housing and the safety shield when the safety shield is in the deployed position, to thereby prevent return of the safety shield to the retracted position.